Chain-driven wrench



W ORINGDERFF.

CHAIN DRIVEN WRENCH.

APPLlCATlON FILED JUNE 26, 1919.

Patented Oct. 26,1920.

' of its principal obi'ects fication.

warren. onmonnmr, or own, ext-mom.

onaxmnmvan wamrcn.

Specification of ietters Patent. I

Application filed June as, 1919. Serial No. 306,892.

To all whom it may concern:

Be it known that I, WALTER Onmonnnrr, at Carmen, in the county of Alfalfa and tate of Oklahoma, have invented certain new and'useful Improvements in Chain-Driven Wrenches, of which the following is a speci- This invention relates to an improved socket wrench particularly designed for removing the bolts of connectingrod bearings.

As is well known, the bearing bolts of the rearmost connecting rod of the engine of a vehicle of the Ford type cannot, without removing the engine from the vehicle, be displaced with the aid of an ordinary wrench. The present invention, therefore, has as one to provide a-wrench whereby, by simp y displacing the bottom plate of the engine crank case, the bearing bolts of the rearmost connecting rod may' be employ readily reached and removed.

The invention has as a further object to provide a wrench wherein unusual leverage will be had upon the socket of the wrench for turning said socket and consequently rotating a nut engaged thereby.

And the invention has as a still further object to provide a wrench which will be simple in construction and which will be adapted to withstand the extreme tests to which a wrench of the present character will, in practical'use, inevitably be subjected.

Other and incidental objects will appear hereinafter.

' In the drawings:

Figure 1 is a sectional view of my improved wrench, and

Fig. 2 is a horizontal sectional view taken on the line 2-2 through the casing of the wrench and looking in the direction of the arrows.

In carrying the invention into effect, I an oblong wrench casing which is medially to define mating casing sec split 10 and 11 respectively. The sections tions of the casings are detachably secured tothe outer end of said shank. The she is I gether by a: plurality of screw bolts or other suitable fastening devices. Projecting within the casing from the sections thereof are oppositely disposed bosses12 arranged adjacent the inner end of the casing-and journaled through these bosses is the shank 13 of an operating shaft 14 detachably connected with the casing by a nut 15 threaded u on of the rearmost provided with a turning crank 16 carrying a PatentedOct. 26, 1920.

suitable handle 17 and swiveled on the outer end of said shaft is a knob or head 18. Formed on the shank 13 is a squared port1on 19 upon which is fitted a sprocket 20 snugly recelved between the bosses 12. Pro-.

jecting within the casing adjacent its outer end are oppositely disposed bosses 21 carried one by each, of the casing sections as in the instance of the'bosses 12 and journaled through these bosses 21 is the shaft 22 of a wrench socket 23. The shaft and socket are preferably integrally formed so that the shaft is, of course, first fitted through the boss of the section 10 of the casing and then through the boss of the section 11. Detachably securing the shaft upon the casing is a nut 24 and formed onsaid shaft is a squared portion 25 with which is engaged a sprocket 26 snugly received between the bosses 18. Trained around the sprockets 20 and 26 is a sprocket chain 27.

As illustrated in Fig. 1, the plates 10 and 11 are provided with continuous in wardly extending flanges 28 which have their edges flatly in contact for providing a dust-tight connection between the plates 10 and 11- and for properly spacing the plates on opposite sides of the sprockets whereby-the bosses 12 and 21 are prevented from having a binding effect on the sprockets. In providing the dust-tight connection between the meeting edges of the continuous flanges 28, the sprocket chain 27 and the socket 23 may be rotated by simply rotating the shaft 14 and in this connection it is to be observed that. the sprocket 26 is somewhat larger than the sprocket 20 so that a corresponding leverage will be had upon the'shaft 22 for rotating the wrench socket. that, after the bottom plate of the engine of a vehicle of the Ford type has been removed, the casing may be inserted .within the engine crank case'and the wrench socket 23 engaged with either of the bearing bolts connecting rod of the engine when, by turning the shaft 14, first one bolt and then the other may be displaced. Similarly, of course, the bolts may be fitted The wrench casing is of such length in position and tightened. It will accordingly be seen that provide a'wrench which will dispense with the necessity for removing the engine from the vehicle in order to gain access to the bolts of the rearmost connecting rod of the engine as is now so commonly practised. The practical advantages of the wrench will, therefore, be at once appreciated. However, while I have indicated that the wrench is particularly designed for use in connection with a motor of the Ford type still, I do not wish to be limited in this regard since the wrench will prove highly cfiicicnt in any situation where found applicable.

Having thus described the invention, what is claimed as new is:

A wrench comprising a casing formed of coacting hollow sections arranged edge to edge and each provided at the medial longitudinal line thereof with a pair of inwardly extending bosses registering with the bosses on the mating section and further provided at the inner Walls of said sections with interiorly threaded lugs, screws engaging the threads of the lugs for securing the sections in assembled position, a shaft having oppositely disposed smooth portions journaled in certain of the bosses section and terminating portion, one of the smooth portions of the shaft being extended beyond the outer face of one section and provided with threads and the other smooth portion being extended beyond the outer face of the other in an operating handle, a sprocket wheel enga ing the squared portion of said shaft and bearing against the adjacent bosses, a nut engaging the threads on the smooth shaft for holding the latter in position on the casing, a second relatively short shaft having an intermediate squared portion and oppositely disposed smooth portions journaled in other of said bosses, one of the smooth portions of said second shaft be ing provided with a terminal socket and the other smootlrportion with threads, a nut engaging said threads, a sprocket wheel fitting the squared portion of the last-mentioned shaft and of greater diameter than the first-mentioned sprocket wheel, and a sprocket chain connecting said sprocket wheels and'engaging the teeth thereof.

In testimony whereof I affix'my signature.

WALTER ()RINGDERFF. [L.s.]

portion of the 

